An ancient manufactory of terra cotta has been lately discovered and unearthed at Arezzo in Tuscany, and a large number of moulds was found, taken apparently from vases executed originally on some hard metal, probably in silver. The figures on these moulds are of the most exquisite design and execution, and for beauty and delicacy of finish exceed anything which remains to us of Greek or Etruscan art. There are no under-cuttings, and the relief is so low and flat as to yield an impression scarcely, if at all, higher than a seal or intaglio. All these moulds, however, are in terra cotta. Not one is in plaster, though in this material they could have been executed more easily and exactly, and could have been reproduced in the original size. Of course, first taken, as they were, in soft clay, then baked, they of necessity shrank in size and were subject to warping and cracking, all which defects would have been avoided had they been made in plaster. All this would indicate that the use of plaster in making moulds was not practiced at that period, even in such a simple operation as this. In face of this we must say we do not agree with Mr. Perkins when he thinks he “establishes by undeniable proof how little founded is the opinion of those who pretend that the ancients did not practice casting in plaster,—sustaining it by the complete absence of statues and statuettes of plaster or fragments of any kind in the excavations, when nevertheless thousands of objects are found of the most fragile nature;” and especially when the undeniable proof which he offers is the existence of some works and arabesque ornaments in plaster found at Kertch, and supposed to belong to the fourth century before the Christian era, and which apparently he has never seen. On the contrary, we should like to know how he explains the fact that no indubitable ancient moulds or castings have ever been found.